Hello Bonnie, Thank you for the file. Unfortunately, I have MC8 and am unable to open the file because of the version difference. If it isn't too much to ask, could you create a folder called 'fibonacci', then in MC save the worksheet as html to that folder and zip it with winzip and e-mail it to me? It's a lot to ask and I understand if you can't take the time. Thanks for your help all the same.